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n.1. s. MILLER AND n. A. LLOYD.

GRINDING 0R CRUSHING MACHINE.

APPLICATION FILED MAY2I. 1918.

Pante May 20, 1915i.

a SHEETS-SHEET I.

Funk

D. 1.6. MILLER AND R. A. LLOYD.

GRINDING OR CRUSHING MACHINE. APPucATloN mio MAY21.1918;

1,304,345. l Patented May 20, 1919.

7.2, ,4 Zay@ 1,304,345. Patented May 20, 1919.

a gums-sneer s.

D. J. G. MILLER AND R. A. LLOYD.

GRINDING 0H CRUSHING MACHINE.

APPLlcAxoN FILED MAY 21. ma

1,304,345. Patented May 20, 1919.

rf.: mmm: Urns :ajusta-uma.. wrm/Numa. n. a

D. l. G. MILLER AND R. A. LLOYD.

GRINDING 0R CRUSHING MACHINE.

APPLicRTloN man MAY 21. |918.

1,304,345,A Patented May 20, 1919.'

8 SHEETSSHEET 5.

n.1. G. MILLER AND R. A. LLoYD.

GRINDING 0H CRUSHING MACHINE.'

APPLICA'TGN FILED MAY 2h 1918.

' 1,304,345. PatenfedMay 20, 1919.

8 SHEETSA-SHET 6.

D..1. G. MILLER AND R. A. LLOYD.

GRINDING 0R CRUSHING MACHINE.

APPLlGATlON FILED MAY 2l, 1918.

Patented May 20, 1919.

8 SHEETS-SHEET 7.

Maf Agay w: Lwams puns :o wmauma.. wAsHma-row, n c.

D.I. G. MILLER AND'R. A.` LLOYD.

GRINDING OR CRUSIIING MACHINE.

APPLICATION FILED MAY ZI. IBIS.

' 1,304,345. PatentedMay 20, 1919.

8 SHEETS-SHEET 8.

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wxfeizar' ZLG-Mder UN ITED STATES PATENT OFFICE.

DONALD JOHN GUNN MILLER, 0F BOOTLE, AND-RICHARD ASSHETON LLOYD, OFLIVERPOOL, ENGLAND. o

GRINDING OR CRUSI-IING MACHINE.

Specification of Letters Patent.

Patented May 20, 1919.

Application led May 21, 1918. Serial No. 235,842.

at Bootle, in the county of Lancaster, England, andl Liverpool, in thecounty of Lancaster, England, respectively, have invented Improvementsin Grinding or Crushing Machines, of which they following is aspecification.

Thisinvention has reference to mills or milling machinery for grindingor pulverizing substances, and. more particularly hard substances,instances of which are slag, ce-

ment, rock, yore,vminerals, and similar substances; but at' the sametime the invention hereinafter described, maybe usedfor the crushing,grinding or pulverizing 'of any,

A arms or carriers ypivoted to a revolving 25 pressed against the ringor path; thematef rial after reductionor pulverization to a granularcondition or impalpable powder, being discharged through a mesh workscreen.

Figure 1 is a side-elevation of apparatus embodying the invention, partsbeing shown Fig. 4 is a 'lan' view of the operating means for the eedvalve, Y

Fig. 5 is a'central vertical sectional view through one of the rolls,

Fig, 6 isva plan viewof a section of rubber serving to close an openingin the rotatable bottom,

Fig. 7 is a side elevation of a vertical spindle or shaft and associatedelements,

Fig. 81 is a similar view, taken at a right angle to Fig. 7, and,

Fig. 9 is a central vertical sectional view through a different form ofapparatus, parts being omitted.

The material to be reduced or ground (which in some cases may be alreadysemiline) is fed onto a revolving receiving table or bottom l, it beingfed into the machine in the manner and by the means hereinafterdescribed with reference to Fig. 8 onto the center of the revolvingtable or pan bottom 1, and thus it is set into motionl circularly, andalso centrifugally toward thev stationary crushing or grinding ring,marked 2.

The crushing rollers 3 are carried and revolve with the pan bottom 1,and so while the material will by this 4means pass onto the crushingsurface or ring 2, it is also carried around bodily with the reducing orcrushing rollers. I Ience ifthe amount 'of material introduced into thecrushing or grinding portion ofthe mill be very large, and more thanis-required normally, the strain on the rol` 1ers 3, due to the presenceof this large or it `otherwise would be.

The crushing ring 2 is removable, and is set and fixed in an outer angleshaped frame 4 by Babbitt or similar metal or other fas- A tening means,and the lower edgeof the ring proper 2 stands a little above the tableor bottom v1. This bottom or table, andthe lower part of the frame 4 andthe ring 2 constitute the pan, the rings being stationary; and theroller upper and lower surfaces, lie within the planes of the lower andupper edges of the crushing ring.

In Fig. 1 the rings 2 and 4 are shown practically flush with the top ofthe rollers 3, but in some cases if desired, these rings, or say thering 4 may be provided with an upwardly projecting part 4X?, having abeveled edge which will receive the centrifugal stream of crushedmaterial coming from the crushing surface of the ring 2, so as toprotect the screen at its lower part from the abrasive action of thecentrifugal material.

The rollers 8, of which there are three in t-he case shown, are carriedby the bottom plate 1, by supporting arms or carriers 5, which arepivoted at 6 to brackets 7 fixed on the under side of the bottom 1, andextend up through guides 8 fixed on the brackets, which take thecircular thrust-and ,other strain-due to the rotation of the botto-m androllers, and the work The rollers 3 are mounted, as shown, on theirshafts or carriers 5 a slight distance above the bottom 1.

The pivots or joints 6 of the roller arms or carriers -the constructionand arrangement of which is hereinafter describedw-are adjustableradially to the vertical` axis of the machine by set screws 10 or otherlike means may be employed.

The roller armsor carriers 5 are thus supported at two points, namely,one near thev roller itself, and the other at the opposite end wherethey are pivoted.

The crushing ring carrier ring frame 4 consists of twoy ring parts, withbridge parts.

4X between them and connecting them; and this frame is supported and xedon a stationary base or bed plate 12 carried on. thel general frame 13of the machine; and where' the bridge parts 4X come, the frame 12-the.

inner edge of which is iush with the inner edge of the outer part of thering'4-is provided with lugs 12X, to which the bridge bars 4X arefastened by bolts or studs; and the ring frame 4 is also secured inposition in the base 12 by keys 14 driven in between the outside of thering 4, and lug projections 14X on the table 12.

The ring' 4 may have an annular groove ring 4 and the pan bottom 1 willpass into the receiver int-o which the reduced powder from the generaldelivery of the machine passes.

This receiving part or chamber in the case shown consists of an annularchannel-shaped chamber 16, which is secured as shown to a depending`ange on the under side of the base plate 12.

In the caseA shown, the upper side ofl the table 1 and the under sideofthe ringJ 4, are

each provided with a ring 17, the faces of which may touch, or nearlytouch, and which will be fastened in a readily detachable manner to thetable and the ring, such as by counter-sunk screws. The meeting faces ofthese rings form a rough working joint between the revolving andstationary parts of the pan; but what dust may pass between them-as itwill at least when Slightly wornwill pass into the powder chamber 16.Vertical adjustment however of the pan bottom 1 is provided for, by anadjustable footstep bearing 20, carried in the frame 13, in which thelower end of the main carryingv and driving shaft 21 of the machineworks, and is supported vertically; its upper end being supported by abearing 22.

The main screen chambery is marked 23, and is formed by the cylindrical.screen 24 of considerably larger diameter than they crush! ing surfaceof the crushing rin-g 2 and fixed on the ring-frame4, and a roof plate25;; and; the .powder receiving chamber 26 is formed outside the screenby the, outside casingV or cylinder 27, fixed on the ring fra1ne=4 andtov theouterpart ofthe roof plate. 25. i j

As constructed and shown, the ring frame 4 and crushing ring2, and theparts; just described fixed iipon it, can readily be l'iifted offtliebedy 12, and so that accessis had to the interior of the pan, andthe rollers, and iinternal parts generally of the machine.

The supply of material tothe mill is controlled by they presence of the.quantity of material in the mill" pan being operated upon; namely, the.position or inclination of the axes of the rollers 3 and their carrierarms, in relation to the vertical central axis of the mill, will: dependupon; the quantity of the material in the pan` and being operated upon;the greater the quantity, the more will be the thickness of thematerialv between the-v surface of the'` grinding ring 2, andftherollers 3; and when there is a relatively large quantity on thesurface of the ring 2, the rollersare moved inward toward the mill axis,and:

a part of, or acted upon by or through the. rol-ler carriers or arms 5will cause a device` a central rod 30 eXtendsf'u-p' from the upper end'of thepan bottom carrier shaft 21,2the

lower end of thisfrod lying within `an axial hole in the shaft, and;within which itis vertically movable; and :this inner rod is raised andlowered through a ring y31 which is fixed-by a pin 32fto the rod 30',passing through t-he ring 31l Sand? ai slot"33 in' the;`

shaft: 21;; and this ring is' operated by' a 25 and ts over the upperend of the driving bell crank 34 pivoted on| theV bottom of the pan .lby a bracket, and which itself is operated by a bar 35 which is fixedonthe roller carrying arm 5, the bar 35 having a pin 36 fixed in a slotin it, which passes loosely through a hole in the arm 5, in which it canturn freely; so that as the arms 5 move inwardly due to the presence ofmaterial between the roller 3 and the pan wall or ring 2, the bellvcrank '34 will be moved, and the ring `.31 and rod 30 will be raised.The rod 30 has a cone 37 on its upper endwhich may be plain orluted-which constitutes a feed or distributing device, and whicheitswithin the lower partof and works vertically-up and ldown in a materialsupply tube 38 fixed in the roof 25 of the chamber 23, vandhaving at itsupper end a hopper-.39. 'The position of the cone 37 in the tube 38regulates an annular space between it and the tube, which constitutesthe annular area for the feed of the'material onto the pan bottom 1; andthis cone may if desired be above the roof 25.

A dust cap 40 is provided on the rod 30 shafts 21.

4The hopper 39,and its depending tube or spout, are stationary, and thetube or spout 38 is adapted to be moved vertically, and adjusted byhand, so that the feed area between Ait and the cone 37 can'be vset andregulated,;inv conjunc'tionwith the vautomatic feed action justdescribed, or without it; and ,this hand feed mechanism consists of ahand operated lever 41 pivoted at 42, andconnected at' its outer forkedend to the tube 38 bylinks 43; so that by pulling the lever down byhand, it willy lift up the tube 38, 4and increase-the -area'of feed.yIts lowering action is effected by aspring 44 (or by afweight) `whichnormallypresses the arm of the lever 41 connected to the tube 38 down;its lowermost position being regu-` lated by an adjustable stop 45.carried in 'a slotted quadrant'46on the arm or bracket 47 which carriesthe lever pivot `42. By adjusting the stop 45, the minimum limitofopening lbetween thevtube 38 and the cone 37 can be effected. The 'cone37 may be zV liuted or it may be plain, but as it revolves i and thebearings 22 and 20,.dustexcluding meansfare provided, consistingof'inverted cups 50 on the .shaft,.tting over projections" 51 on the'bearings, so that any falling dust.

cannot get-finto the bearings.

With regard to the rollers 3, these in oneconstruction have specialcharacteristics. This construction -with the lubricating features,supporting arrangements, carriers, and means for forming a closurebetween the roller carrier arms and the pan bottom 1, is illustrated indetail in 'Figs to 8.

The roller 3 consists of an outer part forming the body, and an innersleeve 53, having a flange 54 between its ends; and the roller body isrecessed at the central lower part, and the' upper surface of the flange54 fit-s and rests against the roof of this recess, and is secured to itby bolts 55. The upper edge of the sleeve 53 isl flush with that of theroller body; and above this part and the upper end of the carrier arm5,"is an inclosing'cap 56, secured to the roller 3 by studs 57; and withinthis cap is the roller, and it works on the journal of the outer end ofthe arm 5.

Outside the lovv'er part of the sleeve 53 there is fitted and lixed `anangle neck ring 60, secured to the sleeve by the-bolts 55 and forming anannular recessl between the sleeve and this ring; and in this annularrecess yor space a packing 62-preferably of the soft kind-fis tted,which is pressed down onto-thecollar 59, and makes a liuid tight jointwith it, by the springv63 and ring 64.` i

This construction of 'the rollers, with packf ings provides anautomatically acting and` hermetically lsealed construction; and

further,l in the construction shown, the

roller is provided with an internal oilwell 66 of annular form, to whichlubricantiis supplied through an openingfnormallyclosed by a stopperG7-in the capi. 56, and

a hole 68 bored in the 'arm-5, and radial holes 69 in it at different'points leading toi the surface of the vsleevefor bush 53; a port orports 70 through -the sleeve'making communication between the armsurface and o-il chamber 66.

e The openings 71 are provided with clos-A ing means., so adapted as toenable them to move radially outward inthe pan bottom. These openingsare of considerable radial length and wider than the arm, and thelclosure or joint between the pan and the arm is of .a removable kind;and inthe case shown the closing deviceconsists of a rub- In lieu of therubber plate 72, a flexible metal plate may be attached similarly to thearm 5, and adapted to slide in a recess;

.120 ber sheet 72 fitted at its outer edge in a rebetween a frame as 73,and the bottom of the recess in the bottom l. f

Referring now to the pivot support G and guide 8 of the arms 5, theseare shown in detail in Figs. 7 and 8.

The pivot'consists of a fixed pin 75, on which a socket fitting 76 ismounted, in which the lower end of the roller arm 5 is fixed; thisportion of' the pivoted socket being nearer the mill axis thanthehorizontal pivot pin 75. The pin 75 has a `rectangular shank 79adapted to slide or be moved by the adjusting screw 10 along the slotr7S formed in the bottom of the bracket 7, and when adjusted to therequired position, the shank 79, which is tapered, is drawn up tight,and so-flxed in the bracket. v

The support 8 in the case shown consists of a cross-head 80 fixed on thearm 5 byv a pin 81 passed through the arm and through the cross-head 80,and working between holding and guiding surfaces on the bracket 7 and anouter bracket S3 fixed to the under side-of the bottom l. A rubber orlike strip or jointing may be provided between say the plate 7X and kthebracket 7; and in the pivot fitting below, in order to furnish a slightamount of elasticity in the arm fittings in the direction of motion ofthe roller carrier arms, the lower ends of same may fit slidably in thesockets, and securedbelow thevsocket with a nut or collar, having ametal or rubber spring between them.

In some cases springs may be used -in connection with the arms orcarriers of the rollers, either above or below their pivots, and may beadjustable so as to varyV their pull or pressure, as the case maybe, onthe rollers, so that the pressure ofthe rollers against the pan wall maybe increased ory diminished at will, inv order to meet cases where thedegree of pressure desired and to be actually used, has to be regulatedor amore or less definite one.

This object may be l accomplished by changing the rollers from lighterto'heavier,

or vi-ce versa, ibut this latter method is inconvenient, and lessexpeditious.

In this machine, if a roller becomes detached by say its spindle orcarrier 5 breaking off at the bottom of the roller, the loose roller byits momentum in the circular path will fly to the pan wall, and wouldtend to revolve in the right direction due to its spinning motion, andthek rotation of the pan bottom with it, and its friction on the. panwalls, till it met the next fixed roller, which would also help itrevolve in the right direction. The contact of' this loose `roller wouldbe thus much less than would be the case of a loose roller' in yastationary pan machine, with overhead carrier plates and' rolls: f

avoided altogether; whereas when a feed is Y delivered onto a'station-ary pan, vthere is always a positionlinf the pan where theamount `of feed' or material preponderates, even if yconducted in frontof the rollers by pipes'orehutes; whereas in this machine, no matterwhether the material is centrally or otherwiseI fed, it would be thrownI cen-` trifugally to thefpan grindingwall or surface evenly. l* i l Thecrushed material passing through the screen 24 into the chamberQG, fallsthrough the opening between the bridges 4X into the annular chamber 16,1in which chamber fan blades 19 iiXed on the underside of the panbottom'l work, and which 'create a minus pressure in this chamber andassist the flow of the material into it and through the screen vandmachine, and also its discharge from it, an opening or openings forwhichwill be provided inthe bottom of lthe chamber- 16 at one ormore'suitablepoints.

A circular hoop forming part of or'sepa rate-from the Aring 4, may beused around the pan.y wall inside thescreen, which Vguards the lowerpart of the screen against the actiony of vthe stuft delivered over thetopof the crushing ring; and consequentlyl the only materialwhich: willstrike'the screen at the lower exposedl partwill be thelighter part,

as the heavierpart which is calculated toV damage-the screen will notrise so high; but

if .this coarser material is required, the lift-A ing vanes' or 'devices86 will 4give it. l0n thefrotatable pan bottom l, inclined devices areprovided'for the purposes of lift-,-

ing 1 and distributing and controlling the material in the pan.v One setof these vanes ordevicesmarked- 85 is adapted to deliver the material tobe ground ina yregulatable film, or `deposit in.` front ofthe rollers3;'

while the other set, marked 86, delivers the ground materiali over andabove the rollers and consequently to the screen 24; and these' vanesordevicescanbe madeto swivel outwardly by centrifugal force, till theyreach a stop lying at a point between the' deviceV arefixedf onthebottom l1, andinclined in a direction shown to help to force thepowder and.v air through the screen; and' they may be anyydepth*recpiired; while in addition to these,` one or 'more vertcallyandradiallyadjustablel brushes90 may be carried onthe bottom l, to brush.the screen as "the pan're-y volves, and prevent the cloggingof same.

With regard to theinclinedlifting device 86, this may be adjustable andinA two'parts as shownin detail inr Fig.v la, the lower part beingxed onthe panr bottom,4 and the upper part fixed on the lower, uponwhich it isadjustable vertically; and. this part may have flange 91 on 'its ,outeredge next the screen@ By means of this device so formed, differentgrades or finenesses of material and such as are requiredtmaybeiproduced, and even heavy material-whicliissometimes required-can beobtained, as the action of the inclined device and its flange9l lissuchthat"- it will deliver the stuff at the required level onto the screen.f

These devices therefore act as distributers, as it were, of the materialonto the screen; and the liange 91 causes the devices to deliver thematerial higher up the screen than would occur if the vanes were planes.

For treating wet material in paste or semipaste condition, themodification of pan shown in Fig. 9 may be used, in which case thematerial is delivered through a chute into an inner vessel or pan 93,having radial conduits or tubes 911 on it, which discharge the materialcentrifugally onto the crushing ring 2; so that the material will bedeposited in quantity on the crushing surface in the required rate.

The rollers can be furnished with Scrapers when dealing with this kindof material, for removing adhering material from them; and the panbottom may be furnished with sliding or trap doors for the expeditiousremoval of this class of material; or it could be delivered by vanesover the pan walls through conduits into receptacles revolving with thepan bottom, or onto a stationary annular pan.

In this case, as in others, the pan bottom will revolve, and with it theinner pan 93 and conduit 94.

In a modification where wet material is to be operated upon, the drivingshaft or pan revolving bottom may have radial blades or scoop arms onit, and the pan may be filled with material in bulk to be ground, andafter being operated upon for the required length of time it may beemptied by the scoop arms, which whengrinding will be raised up out ofthe material, but when it is required to empty the pan they are loweredinto the material which lifts it out of the pan.

The machine shown is under-driven by the driving belt wheel 100 on theshaft 21;

. but if desired, it may be driven by a pulley or bevel wheels fromabove, in which case the shaft 21 would be extended upward, and throughthe chamber 23 and driven from that end; and the feed or supply conduitswould be placed to one side of the axis of the machine, or eccentricthereto.

Whatiis claimed is :`-Vv a l. In a mill of the character described, arelatively .stationary supporting ring, a grinding ring held therein, arotatable bottom arranged beneath the relatively stationary supportingring, means to rotate the botto1n,.a plurality of upstandingshaftsconnected `withthe bottom to rotate vtherewith andadapted to beshifted radially with relation tothe bottom, rollers carried Lby theshafts and arranged yto kContact with the grinding ring, yielding meansto oppose the rinward radial movement of the shafts, 'and :feeding meansto supply material to be ground to said bottom and automaticallyoperated by the inward radial movement of the shafts.

2. In a mill of the character described, a relatively stationarysupporting ring, a' grinding ring held therein, a rotatable bottomarranged near and beneath the supporting ring, means to rotate thebottoni, a plurality of supports connected with the bottom and dependingtherefrom, a plurality of normally substantially vertical shaft-spivotally connected with-the supports to swingradially of the bottom andextending through and above the bottom, means to opv pose the inwardradial swinging movement of the shafts, rollers carried bythe shafts anddisposed to contact with the grinding ring, feeding mechanism arrangedsubstantially centrally of the bottom to supply material thereto, andmeans operated by the movement of said shafts in a radial direction toadjust the feeding mechanism.

3. In a mill of the character described, a relatively stationarygrinding ring, a bottom arranged near and beneath the same, means tosupport and rotate the bottom, a normally vertical shaft connected withthe bottom and adapted to move radially with relation thereto, a rollercarried by the shaft to contact with the grinding ring, a feed tubearranged above and near the bottom, a vertically movable shaft carryinga valve to control the passage of' material from the feed tube, and abell crank lever having connection with the first named shaft to bemoved upon its radial movement and connected with the vertically movableshaft to shift it.

4. In a mill of the character described, a relatively stationarygrinding ring, a bottom arranged near and beneath the same and providedwith a radial opening, means to support and rotate the bottom, a supportconnected with the bottom and depending therefrom, a substantiallyvertical shaft pivotally connected with the support and projectingthrough the radial opening, a

c movable member to cover the opening and attached to the verticalshaft'to be lshifted thereby, a roller carried by the shaft andcontacting With the grinding ring., and means to feed material upon thebottom.

5. In a mill of the character described, a stationary support` includinginner and outer spaced concentric rings, an annular trough arranged nearand beneath said rings to receive material therefrom, a rotatabletabledisposed near ysaid rings, vanessecured to the table and projecting intothey annular trough, a grinding ringsecuned to the inner ring, aplurality of vertical .shafts .carried Vnac,faenas bythe tableand'projecting above :the same, 15 rollers icanried bythe :shafts tocontact With the grinding ring, aneansto feed material Lto thecentral:portion of the bottom, and means to trotate 'fthe bottom.

' In testimony Whereof'we have signedfour 20 naines to this:specification in the presence of tWosubscr-ibing Witnesses.

DONALD JOHN yGUNN MILLER. RICHARD SS'HE'ION LLOYD.

Witnesses:

' Somnvinnn GooDALL,

Pnnor-Snannoon.

Copies of this. .pa-tent may `be obtained for veents each,y byaddressingthe Commissioner @oflateatx` Washingtom-,DCP

